风电场塔筒螺栓腐蚀分析

Analysis of Corrosion of Bolts in Wind Power Tower Tube

目的分析风电场塔筒螺栓的腐蚀现状。方法采用化学成分分析、金相分析、冲击性能测试、拉伸性能测试、硬度测试等方法对螺栓进行分析。结果使用前后螺栓螺母垫圈的成分均符合标准。对使用前后的螺栓进行冲击、拉伸、硬度性能测试均符合安全要求。使用前后,螺栓金相为1~4级,符合国家标准。晶粒度测试显示,使用前为7.5~8.0级,使用后为8级。通过螺栓截面成分分析,锈层内渗入的氯离子促进了腐蚀的发生。结论在役的螺栓满足安全使用要求;在恶劣的自然环境的综合作用下,螺栓发生了电化学腐蚀和缝隙腐蚀;最后对螺栓的使用及维护提出建议。

In view of the corrosion status of bolts in wind power towers,chemical composition analysis,metallographic analysis,impact property test,tensile property test,hardness test and other methods were used to analyze the bolts.The results show that the composition of bolts,nuts,washers before and after use meets the standard.The impact,tensile,and hardness per-formance tests on the bolts before and after use all meet the safety requirements.The metallography of the bolts before and after use is 1~4,in line with national standards,and the grain size test shows that it is 7.5~8.0 before use and is 8 after use.Therefore,it is concluded that the bolts in service meet the requirements for safe use;under the combined action of the harsh natural envi-ronment,the bolts have undergone electrochemical corrosion and crevice corrosion.Finally,suggestions are made for the use and maintenance of bolts.